fix: fix missing packages when sdk-style-project has project-reference to non-sdk-style-project

[wgnf]

📫 Addressed Issue(s)

• Closes #116

📄 Description

This bug was observed a long time ago. When an SDK-Style-Project has a project-reference to a Non-SDK-Style project, and one starts analysing the SDK-Style-Project with IncludeTransitiveDependencies turned on, the package-references in the Non-SDK-Style project are not included.

✅ Checks

• [x] My PR adheres to the general code-style of this project (look at other code if you're unsure)
• ~[ ] My code requires changes to the documentation~
• ~[ ] I have updated the documentation as required~
• [x] All the automated tests have passed

[codecov[bot]]

Codecov Report

Merging #124 (8f0590a) into main (6670bfe) will increase coverage by 0.04%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #124      +/-   ##
==========================================
+ Coverage   96.78%   96.83%   +0.04%     
==========================================
  Files          54       54              
  Lines        2305     2335      +30     
==========================================
+ Hits         2231     2261      +30     
  Misses         74       74              

Impacted Files	Coverage Δ
src/Core/Liz.Core/Projects/GetProjectReferences.cs	100.00% <100.00%> (ø)
.../Core/Liz.Core/Projects/GetProjectsViaSlnParser.cs	97.93% <100.00%> (+0.87%)	:arrow_up:

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